pytorch

25fba4a0 - [DOC] Add link to "double backward" from "extending pytorch" page (#72584)

[DOC] Add link to "double backward" from "extending pytorch" page (#72584) Summary: It is probably the most user friendly to link to that (lesser known?) feature. Pull Request resolved: https://github.com/pytorch/pytorch/pull/72584 Reviewed By: soulitzer Differential Revision: D34173999 Pulled By: albanD fbshipit-source-id: 99fff7a55412faf54888f8317ab2388f4d7d30e4 (cherry picked from commit 2191ee76570b8c22a16aca75f947ece38e6ca3cf)